They had airlifts flown to Berlin to drop supplies
The end of WWII introduced the baby boomer generation. This happened all over the world, but mainly in the West. The elevated birthrate in the US added about 50 million babies by the end of the 1950s. Hope this was it.
Abundace of manufacturing jobs
Mountains isolated the city-states Athens and Sparta. Those city states had different cultures and they were at war.
Hope this helps.
